cregit-Linux how code gets into the kernel

Release 4.7 crypto/seqiv.c

Directory: crypto
/*
 * seqiv: Sequence Number IV Generator
 *
 * This generator generates an IV based on a sequence number by xoring it
 * with a salt.  This algorithm is mainly useful for CTR and similar modes.
 *
 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/internal/geniv.h>
#include <crypto/internal/skcipher.h>
#include <crypto/rng.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>


struct seqiv_ctx {
	
spinlock_t lock;
	
u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
};

static void seqiv_free(struct crypto_instance *inst);


static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err) { struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); struct crypto_ablkcipher *geniv; if (err == -EINPROGRESS) return; if (err) goto out; geniv = skcipher_givcrypt_reqtfm(req); memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv)); out: kfree(subreq->info); }

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static void seqiv_complete(struct crypto_async_request *base, int err) { struct skcipher_givcrypt_request *req = base->data; seqiv_complete2(req, err); skcipher_givcrypt_complete(req, err); }

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static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err) { struct aead_request *subreq = aead_request_ctx(req); struct crypto_aead *geniv; if (err == -EINPROGRESS) return; if (err) goto out; geniv = crypto_aead_reqtfm(req); memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv)); out: kzfree(subreq->iv); }

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static void seqiv_aead_encrypt_complete(struct crypto_async_request *base, int err) { struct aead_request *req = base->data; seqiv_aead_encrypt_complete2(req, err); aead_request_complete(req, err); }

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static void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq, unsigned int ivsize) { unsigned int len = ivsize; if (ivsize > sizeof(u64)) { memset(info, 0, ivsize - sizeof(u64)); len = sizeof(u64); } seq = cpu_to_be64(seq); memcpy(info + ivsize - len, &seq, len); crypto_xor(info, ctx->salt, ivsize); }

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static int seqiv_givencrypt(struct skcipher_givcrypt_request *req) { struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); crypto_completion_t compl; void *data; u8 *info; unsigned int ivsize; int err; ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv)); compl = req->creq.base.complete; data = req->creq.base.data; info = req->creq.info; ivsize = crypto_ablkcipher_ivsize(geniv); if (unlikely(!IS_ALIGNED((unsigned long)info, crypto_ablkcipher_alignmask(geniv) + 1))) { info = kmalloc(ivsize, req->creq.base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: GFP_ATOMIC); if (!info) return -ENOMEM; compl = seqiv_complete; data = req; } ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl, data); ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst, req->creq.nbytes, info); seqiv_geniv(ctx, info, req->seq, ivsize); memcpy(req->giv, info, ivsize); err = crypto_ablkcipher_encrypt(subreq); if (unlikely(info != req->creq.info)) seqiv_complete2(req, err); return err; }

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static int seqiv_aead_encrypt(struct aead_request *req) { struct crypto_aead *geniv = crypto_aead_reqtfm(req); struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv); struct aead_request *subreq = aead_request_ctx(req); crypto_completion_t compl; void *data; u8 *info; unsigned int ivsize = 8; int err; if (req->cryptlen < ivsize) return -EINVAL; aead_request_set_tfm(subreq, ctx->child); compl = req->base.complete; data = req->base.data; info = req->iv; if (req->src != req->dst) { struct blkcipher_desc desc = { .tfm = ctx->null, }; err = crypto_blkcipher_encrypt(&desc, req->dst, req->src, req->assoclen + req->cryptlen); if (err) return err; } if (unlikely(!IS_ALIGNED((unsigned long)info, crypto_aead_alignmask(geniv) + 1))) { info = kmalloc(ivsize, req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: GFP_ATOMIC); if (!info) return -ENOMEM; memcpy(info, req->iv, ivsize); compl = seqiv_aead_encrypt_complete; data = req; } aead_request_set_callback(subreq, req->base.flags, compl, data); aead_request_set_crypt(subreq, req->dst, req->dst, req->cryptlen - ivsize, info); aead_request_set_ad(subreq, req->assoclen + ivsize); crypto_xor(info, ctx->salt, ivsize); scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1); err = crypto_aead_encrypt(subreq); if (unlikely(info != req->iv)) seqiv_aead_encrypt_complete2(req, err); return err; }

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static int seqiv_aead_decrypt(struct aead_request *req) { struct crypto_aead *geniv = crypto_aead_reqtfm(req); struct aead_geniv_ctx *ctx = crypto_aead_ctx(geniv); struct aead_request *subreq = aead_request_ctx(req); crypto_completion_t compl; void *data; unsigned int ivsize = 8; if (req->cryptlen < ivsize + crypto_aead_authsize(geniv)) return -EINVAL; aead_request_set_tfm(subreq, ctx->child); compl = req->base.complete; data = req->base.data; aead_request_set_callback(subreq, req->base.flags, compl, data); aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen - ivsize, req->iv); aead_request_set_ad(subreq, req->assoclen + ivsize); scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0); return crypto_aead_decrypt(subreq); }

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static int seqiv_init(struct crypto_tfm *tfm) { struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm); struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); int err; spin_lock_init(&ctx->lock); tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request); err = 0; if (!crypto_get_default_rng()) { crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt; err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, crypto_ablkcipher_ivsize(geniv)); crypto_put_default_rng(); } return err ?: skcipher_geniv_init(tfm); }

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static int seqiv_ablkcipher_create(struct crypto_template *tmpl, struct rtattr **tb) { struct crypto_instance *inst; int err; inst = skcipher_geniv_alloc(tmpl, tb, 0, 0); if (IS_ERR(inst)) return PTR_ERR(inst); err = -EINVAL; if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64)) goto free_inst; inst->alg.cra_init = seqiv_init; inst->alg.cra_exit = skcipher_geniv_exit; inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize; inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx); inst->alg.cra_alignmask |= __alignof__(u32) - 1; err = crypto_register_instance(tmpl, inst); if (err) goto free_inst; out: return err; free_inst: skcipher_geniv_free(inst); goto out; }

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static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb) { struct aead_instance *inst; struct crypto_aead_spawn *spawn; struct aead_alg *alg; int err; inst = aead_geniv_alloc(tmpl, tb, 0, 0); if (IS_ERR(inst)) return PTR_ERR(inst); inst->alg.base.cra_alignmask |= __alignof__(u32) - 1; spawn = aead_instance_ctx(inst); alg = crypto_spawn_aead_alg(spawn); err = -EINVAL; if (inst->alg.ivsize != sizeof(u64)) goto free_inst; inst->alg.encrypt = seqiv_aead_encrypt; inst->alg.decrypt = seqiv_aead_decrypt; inst->alg.init = aead_init_geniv; inst->alg.exit = aead_exit_geniv; inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx); inst->alg.base.cra_ctxsize += inst->alg.ivsize; err = aead_register_instance(tmpl, inst); if (err) goto free_inst; out: return err; free_inst: aead_geniv_free(inst); goto out; }

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static int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb) { struct crypto_attr_type *algt; int err; algt = crypto_get_attr_type(tb); if (IS_ERR(algt)) return PTR_ERR(algt); if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) err = seqiv_ablkcipher_create(tmpl, tb); else err = seqiv_aead_create(tmpl, tb); return err; }

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static void seqiv_free(struct crypto_instance *inst) { if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) skcipher_geniv_free(inst); else aead_geniv_free(aead_instance(inst)); }

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static struct crypto_template seqiv_tmpl = { .name = "seqiv", .create = seqiv_create, .free = seqiv_free, .module = THIS_MODULE, };
static int __init seqiv_module_init(void) { return crypto_register_template(&seqiv_tmpl); }

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static void __exit seqiv_module_exit(void) { crypto_unregister_template(&seqiv_tmpl); }

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module_init(seqiv_module_init); module_exit(seqiv_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Sequence Number IV Generator"); MODULE_ALIAS_CRYPTO("seqiv");

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Directory: crypto
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